The sections in this article are Introduction Biocompatible Coatings Protein‐Repellant Coatings PEG ylated Thin Films Non‐ PEG ylated Hydrophilic Thin Films Thin Films of Hyperbranched Polymers Multilayer Thin Films Antithrombogenic Coatings Surface Chemistry and Blood Compatibility Membrane‐Mimetic Thin Films Heparin‐Mimetic Thin Films Clot‐Lyzing Thin Films Polyelectrolyte Multilayer Thin Films Polyurethane Coatings Vapor‐Deposited Thin Films Antimicrobial Coatings Cationic Polymers Nanocomposite Polymer Thin Films Incorporating Inorganic Biocides Antibiotic‐Conjugated Polymer Thin Films Biomimetic Antibacterial Coatings Thin Films Resistant to the Adhesion of Viable Bacteria Coatings for Tissue Engineering Substrates PEG ylated Thin Films Zwitterionic Thin Films Thin Films of Hyperbranched Polymers Polyurethane Coatings Polysaccharide‐Based Thin Films Polyelectrolyte Multilayer Thin Films Temperature‐Responsive Polymer Coatings Electroactive Thin Films Other Functional Polymer Coatings Multilayer Thin Films for Cell Encapsulation Patterned Thin Films Polymer Thin Films for Drug Delivery Polymer Thin Films for Gene Delivery Conclusions

Degradation of metal-organic halide perovskites when exposed to ambient conditions is a crucial issue that needs to be addressed for commercial viability of perovskite solar cells (PSCs). Here, a concept of encapsulating CH3NH3PbI3 perovskite crystals with a multi-functional graphene-polyaniline (PANI) composite coating to protect the perovskite against degradation from moisture, oxygen and UV light is presented. Hole-conducting polymers containing 2D layered sheet materials are presented here as multi-functional materials with oxygen and moisture impermeability. Specific studies involving PANI and graphene composites as coatings for perovskite crystals exhibited resistance to moisture and oxygen under continued exposure to UV and visible light. Most importantly, no perovskite degradation was observed even after 96 h of exposure of the PSCs to extremely high humidity (99% relative humidity). Our observations and results on perovskite protection with graphene/conducting polymer composites open up opportunities for glove-box-free and atmospheric processing of PSCs.

Self-assembling polysaccharide nanostructures have moved to the forefront of many fields due to their wide range of functional properties and unique advantages, including biocompatability and stimulus responsiveness. In particular, the field of controlled release, which involves influencing the location, concentration, and efficacy of active pharmaceutical ingredients (APIs), diagnostics, nutrients, or other bioactive compounds, has benefited from polysaccharide biomaterials. Nanostructure formation, stimulus responsiveness, and controlledrelease performance can be engineered through facile chemical functionalization and noncovalent intermolecular interactions. This review discusses polysaccharide nanoparticles, designed for targeted and time-controlled delivery of emerging APIs, with improved in vivo retention, stability, solubility, and permeability characteristics. Topics covered include nanoparticles of cyclodextrin and cyclodextrin-containing polymers, hydrophobically modified polysaccharides, polysaccharide nanoparticles that respond to pH, temperature, or light stimulus, polysaccharide prodrug complexes, polysaccharide complexes with lipids and proteins, and other polysaccharide polyelectrolyte complexes.

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A novel visible-light-absorbing dilute alloy, Ga(Sbx)N1-x is synthesized by metal organic chemical vapor deposition (MOCVD) for solar hydrogen production. Significant bandgap reduction of GaN, from 3.4 eV to 1.8 eV, is observed, with a low (2%) incorporation of antimonide, and the lattice expansion is in agreement with our first-principles calculations. The band edges of Ga(Sbx)N1-x are found to straddle the water redox potentials showing excellent suitability for solar water splitting.

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